How to Replace Serpentine Belt Tensioner 05-10 Chrysler 300

Difficulty: Intermediate · About 30 min · Chrysler 300

Replace the serpentine belt tensioner on a 2005-2010 Chrysler 300.

Steps

1. Remove the serpentine belt

   Familiarize yourself with the belt routing diagram, fit a 3/8-inch drive into the square at the bottom of the tensioner, rotate it clockwise, then pull the belt off.

2. Remove the old tensioner

   Remove the 15mm bolt securing the tensioner pulley to the engine, then take it out.

3. Install the new tensioner

   Insert it into the engine, tighten the 15mm bolt, then torque it to about 40 ft-lb.

4. Reinstall the serpentine belt

   With the ribs facing the engine, slide the belt between the tensioner pulley and the engine, flip it so the smooth side touches the tensioner, loop it around the crank pulley, the A/C compressor, the power steering pulley, the idler pulley and the tensioner, pull the tensioner clockwise with the 3/8-inch ratchet, loop the belt around the alternator, then release the tensioner.

Check your vehicle’s repair manual for exact specifications and fit.